A RHEL 6 start/stop/status script for carbon-cache

carbon-cache.init

#!/bin/bash
#
# chkconfig: 2345 92 17
# description: Backend data caching and persistence daemon for Graphite
#

# Source function library.
. /etc/rc.d/init.d/functions

PROG='carbon-cache'
PIDFILE="/opt/graphite/storage/${PROG}-a.pid"
SUBSYSFILE="/var/lock/subsys/$PROG"
EXEC="/opt/graphite/bin/${PROG}.py"
RETVAL=0

start() {
    if [ $UID -ne 0 ]; then
        echo "User has insufficient privilege."
        exit 1
    fi

    $EXEC start
    RETVAL=$?
    [ $RETVAL -eq 0 ] && touch $SUBSYSFILE
}

stop() {
    if [ $UID -ne 0 ]; then
        echo "User has insufficient privilege."
        exit 1
    fi

    $EXEC status > /dev/null 2>&1
    STATUS_RETVAL=$?

    [ $STATUS_RETVAL -eq 0 ] && PID=`cat $PIDFILE`

    $EXEC stop
    RETVAL=$?
    if [ $RETVAL -eq 0 ] && [ $STATUS_RETVAL -eq 0 ]; then
        while [ -d /proc/$PID ]
        do
            echo "waiting for carbon-cache to shutdown..."
            sleep 5
        done
        echo "carbon-cache shutdown complete"
    fi
    [ $RETVAL -eq 0 ] && [ -f $SUBSYSFILE ] && rm $SUBSYSFILE
}

status() {
    $EXEC status
    RETVAL=$?
}

case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    restart|reload)
        stop
        start
        ;;
    status)
        status
        ;;
    *)
        echo $"Usage: $0 {start|stop|restart|reload|status}"
        exit 1
esac

exit $RETVAL